Chromium soap



Patented Dec. 29, 1925.

UNITED STATES THOMAS '1; GRAY, OF ELIZABETH, NEW JERSEY.

CHROMIUM SOAP.

, No Drawing.

To all whom it may concern:

Be it known that I, THOMAS T. GRAY, a citizen of the United States, and a resident of Elizabeth, county of Union, State of New Jersey, have invented an Improvement in Chromium Soaps, of which the following is a specification.

The present invention relates to detergents and more particularly to the manufacture of a soap suitable for general use and especially suitable for use in the preparation of shaving soap, cold cream, tooth paste, mouth washes and the like.

The invention has for an object to provide an improved detergent which will not have a disagreeable taste or odor, and which will not be irritating to the skin, eyes and other membranes of the body,

Another object is to provide a method of making the detergent.

The invention rovides a soap which has fine lathering and detergent properties and yet does not possess the pronounced disagreeable taste or other objectionable properties of ordinary toilet soaps such as that of cansing the eyes and skin to smart.

The harsh action of ordinary toilet soaps is probably due to the hydrolysis of the neutral soap during which process free alkali is liberated. This free alkali attacks the more sensitive membranes and causes sore-' ness and smarting. I have discoveredthat a soa which is free of the objectionable'irritatmg qualities above mentioned can manufactured by the use of a chromium salt, such for example as chromium hydroxide or chromium carbonate. If the soap is made entirely of a chromium salt with a fatty acid or the like while soluble in water, it

does not form a good lather. I have found,

however, that if another soap having good tics above indicated can be manufactured from the several suitable fatty acids and fatty materials used in the manufacture of sodium and potassium soap and by substan tially similar processes. In the process se- Application filed October 3, 1922- Serial N0. 592,042.

lected for description herein a fatty acid or other fatty material is melted and saponified with chromium hydroxide, which is slowly added in small portions. The hydroxide may be suspended in water and added in this condlt on. The mixture is heated during the reaction by any suitable means as, for example, by a steam coil. Chemical tests are made from time to time and when the neutral point is reached and the saponification is complete the adding of the chromium hydroxide or its equivalent is discontinued. The soap is then boiled down to the desired concentration.

If the compounds used in making the soap are sufiiciently pure theoretical weights thereof may be used, these weights being calculated from the formula of the reaction, taking into account the molecular weights of the substances. For example, if a soap of chromium h droxide and stearic acid were to be made t e reaction would, it is believed, take place in accordance with'the formula:

to the soap but other suitable coloring matter and any desired flavoring, perfumlng or medicinal agents may be added.

The soap made as above may be combined to advantage with sodium potassium or ammonium soaps or a mixture thereof to form a compound soap. The proportions of the chromium soap to the other soa or soaps may vary within wide limits. I ave found that soaps in which the proportions vary between one part of chromium to five parts of other soap and one part of other soap to five parts of chromium soa retain in a satisfactory degree the properties of the separate soa s.

15s a particular example I have found a soap containing approximately two parts of neutral sodium soap, two parts of neutral chromium soap and one part of water to be neutral and tasteless and to ossess fine lathering and detergent properties. Such a soap is suitable for use in the preparation of shaving soap, shaving cream, tooth paste, and other toilet, medicinal or pharmaceutical preparations requiring a soap of this character.

I have described the compound soap as made by combining unmixed chromium soap with unmixed sodium or other soap but a similar product may be obtained by saponifying the fat with a suitable mixture of chromium compounds and sodium potassium or ammonium compounds or a mixture thereof.

The particular description herein is merely illustrative and is not intended to define the limits of the invention. Various modifica tions in both the product and the method of manufacture can be made within the scope of the invention.

I claim as my invention:

1. A detergent containing chromium stearates combined with sodium and sium stearates.

2. A detergent com ound containing alkali' metal soap and c romium soapin approximately equal proportions.

3. A detergent comprising a chromium soap and an alkali metal soap combined in a ratio of between 1 to 5 and 5 to 1, substantially as described.

4. A detergent comprising a chromium soap and a sodium soap combined in a ratio of between 1 to 5 and 5 to 1 substantially as described.

5. A detergent comprising a compound chromium sodium soap comprising chromium and sodium soaps in approximately equal proportions.

6. A tasteless detergent combining approximately two parts of chromium soap, two parts of alkali metal soap and one part of water.

In testimony whereof, I have signed my name to this specification this th day of September, 1922.

. THOS. T. GRAY.

potas- 

